[racket-users] DrRacket debugger error

[copycat]

I get the following error: 

module: cannot use identifier tainted by macro transformation in: module

when i try to debug a multi-file program with both untyped and typed scripts in 
it. If it's just untyped scripts it will work fine.

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Re: [racket-users] Why no "type checking" for C arrays?

[Matthew Flatt]

That's an oversight. I'll push an improvement.

Even with the improvement I have now, checking is not as complete as
you might like. The check ensures that an array value has (at least)
the expected number of elements and that each element's layout (in the
sense of `ctype->layout`) is as expected. Checking only the element
layout is weaker than checking the element type, but requiring the
types to be `eq?` ctypes seems too strong, and the ctype API doesn't
enable a more flexible notion of equality.

At Tue, 10 May 2016 18:03:07 +0200, Berthold Bäuml wrote:
> When copying a C array into a a field of a C struct there seems to be no 
> “type 
> checking”, i.e., at least a check for element type and array length/size. 
> This 
> leads to a Segmentation fault when running the code below. Could such a check 
> be added? The relevant information should be available to (make-ct or 
> set-ct-arr …).
> 
> 
> #lang racket
> (require ffi/unsafe)
> 
> (define _at2 (_array _double 500))
> (define _at1 (_array _double 5))
> 
> (define-cstruct _ct ([arr _at2]))
> (define a (ptr-ref (malloc _at1) _at1))
> (define c (make-ct a))
> 
> 
> Best,
> Berthold
> 
> -- 
> ---
> Berthold Bäuml -- Head of Autonomous Learning Robots Lab
> DLR, Robotics and Mechatronics Center (RMC)
> Münchner Str. 20, D-82234 Wessling
> Phone +49 8153 282489
> http://www.robotic.de/Berthold.Baeuml

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[racket-users] Why no "type checking" for C arrays?

[Berthold Bäuml]

When copying a C array into a a field of a C struct there seems to be no “type 
checking”, i.e., at least a check for element type and array length/size. This 
leads to a Segmentation fault when running the code below. Could such a check 
be added? The relevant information should be available to (make-ct or 
set-ct-arr …).


#lang racket
(require ffi/unsafe)

(define _at2 (_array _double 500))
(define _at1 (_array _double 5))

(define-cstruct _ct ([arr _at2]))
(define a (ptr-ref (malloc _at1) _at1))
(define c (make-ct a))


Best,
Berthold

-- 
---
Berthold Bäuml -- Head of Autonomous Learning Robots Lab
DLR, Robotics and Mechatronics Center (RMC)
Münchner Str. 20, D-82234 Wessling
Phone +49 8153 282489
http://www.robotic.de/Berthold.Baeuml

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Re: [racket-users] PLT Redex to Coq

[Robby Findler]

Unfortunately there is nothing to help with this currently.

Robby

On Tuesday, May 10, 2016, Beta Ziliani  wrote:

> Dear list,
>
> A colleague of mine used PLT Redex to define a language and its semantics,
> but now he wants to prove some properties of it in Coq. He's wondering if
> there is a tool to translate PLT Redex definitions into Coq ones, or if he
> should write all of them from scratch.
>
> Many thanks,
> Beta
>
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[racket-users] PLT Redex to Coq

[Beta Ziliani]

Dear list,

A colleague of mine used PLT Redex to define a language and its semantics, but 
now he wants to prove some properties of it in Coq. He's wondering if there is 
a tool to translate PLT Redex definitions into Coq ones, or if he should write 
all of them from scratch.

Many thanks,
Beta

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